Waterfall sink



FIG. 1 is a top perspective view of a waterfall sink embodying my new design;

FIG. 2 is a front plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side plan view thereof;

FIG. 5 is a left side plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings represent unclaimed environment and form no part of the claimed design. 

CLAIM The ornamental design for a waterfall sink, as shown and described. 